got it to work - one of the times when it said SYSTEM SOFTWARE MISSING when rebooted the nuvi stuck on LOADER LOADING screen - after manual reboot - the nuvi loaded to the 34xx firmware. Then it was a bit tricky to enter pre-boot mode to flash the LOGO - but after a few tries I managed.
I have tried many times to go to Debug menu from Volume menu - never managed to do it. (from Trip Computer menu I can enter any time).
Also I have a question - I see there is DeviceConfig_VideoPlayback_Enabled.xml - what files are supported ?
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